sign.c revision 296465 
1/* demos/sign/sign.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/*
60 * sign-it.cpp - Simple test app using SSLeay envelopes to sign data
61 * 29.9.1996, Sampo Kellomaki <sampo@iki.fi>
62 */
63
64/* converted to C - eay :-) */
65
66/*
67 * reformated a bit and converted to use the more common functions: this was
68 * initially written at the dawn of time :-) - Steve.
69 */
70
71#include <stdio.h>
72#include <openssl/rsa.h>
73#include <openssl/evp.h>
74#include <openssl/objects.h>
75#include <openssl/x509.h>
76#include <openssl/err.h>
77#include <openssl/pem.h>
78#include <openssl/ssl.h>
79
80int main()
81{
82    int err;
83    int sig_len;
84    unsigned char sig_buf[4096];
85    static char certfile[] = "cert.pem";
86    static char keyfile[] = "key.pem";
87    static char data[] = "I owe you...";
88    EVP_MD_CTX md_ctx;
89    EVP_PKEY *pkey;
90    FILE *fp;
91    X509 *x509;
92
93    /*
94     * Just load the crypto library error strings, SSL_load_error_strings()
95     * loads the crypto AND the SSL ones
96     */
97    /* SSL_load_error_strings(); */
98    ERR_load_crypto_strings();
99
100    /* Read private key */
101
102    fp = fopen(keyfile, "r");
103    if (fp == NULL)
104        exit(1);
105    pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
106    fclose(fp);
107
108    if (pkey == NULL) {
109        ERR_print_errors_fp(stderr);
110        exit(1);
111    }
112
113    /* Do the signature */
114
115    EVP_SignInit(&md_ctx, EVP_sha1());
116    EVP_SignUpdate(&md_ctx, data, strlen(data));
117    sig_len = sizeof(sig_buf);
118    err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
119
120    if (err != 1) {
121        ERR_print_errors_fp(stderr);
122        exit(1);
123    }
124
125    EVP_PKEY_free(pkey);
126
127    /* Read public key */
128
129    fp = fopen(certfile, "r");
130    if (fp == NULL)
131        exit(1);
132    x509 = PEM_read_X509(fp, NULL, NULL, NULL);
133    fclose(fp);
134
135    if (x509 == NULL) {
136        ERR_print_errors_fp(stderr);
137        exit(1);
138    }
139
140    /* Get public key - eay */
141    pkey = X509_get_pubkey(x509);
142    if (pkey == NULL) {
143        ERR_print_errors_fp(stderr);
144        exit(1);
145    }
146
147    /* Verify the signature */
148
149    EVP_VerifyInit(&md_ctx, EVP_sha1());
150    EVP_VerifyUpdate(&md_ctx, data, strlen((char *)data));
151    err = EVP_VerifyFinal(&md_ctx, sig_buf, sig_len, pkey);
152    EVP_PKEY_free(pkey);
153
154    if (err != 1) {
155        ERR_print_errors_fp(stderr);
156        exit(1);
157    }
158    printf("Signature Verified Ok.\n");
159    return (0);
160}
161